Looping through a datagrid

Question

How do I loop through a datagrid which contrains 10000s of rows of data and copy and paste say for example every 10th row in a new table using a loop?

The reason why I want to do this is because I have a MS SQL database of stock market price data, every row contrains price data for that minute, see example below,

Date, Time, Open, High, Low, Close, Up Volume, Down Volume,

12/07/1993,1303,2183.00,2183.00,2183.00,2183.00,0,1
12/07/1993,1304,2183.00,2183.00,2183.00,2183.00,0,2
12/07/1993,1305,2183.50,2183.50,2183.50,2183.50,5,0
12/07/1993,1306,2183.00,2183.50,2183.00,2183.50,2,1
12/07/1993,1308,2183.50,2183.50,2183.50,2183.50,1,0
12/07/1993,1310,2183.50,2183.50,2183.50,2183.50,2,0

I am trying to create 5 more tables to show 1 minute data, 5 min data, 10 min data 15 min data, 30 min data and 1 hour data all using my original 1 minute data as the foundation for creating these new tables. (Thats why I wanted to copy and paste say every 5th row for 5min datatable, every 10th row for 10min datatable etc)

How do I do this please?